add inspect method to dictionary

lib/typed/parfait/dictionary.rb

@@ -84,6 +84,14 @@ module Parfait
       self
     end
 
+    def inspect
+      string = "Dictionary{"
+      each do |key , value|
+        string += key.to_s + " => " + value.to_s + " ,"
+      end
+      string + "}"
+    end
+
     def to_sof_node(writer , level , ref)
       Sof.hash_to_sof_node( self , writer , level , ref)
     end

test/typed/parfait/test_dictionary.rb

@@ -30,6 +30,15 @@ class TestDictionary < MiniTest::Test
     test_one_set2
     assert_equal :some , @lookup.get(1)
   end
+  def test_inspect1
+    @lookup[:key] = :value
+    assert_equal "Dictionary{key => value ,}" , @lookup.inspect
+  end
+  def test_inspect2
+    @lookup[:key1] = :value1
+    @lookup[:key2] = :value2
+    assert_equal "Dictionary{key1 => value1 ,key2 => value2 ,}" , @lookup.inspect
+  end
   def test_many_get
     shouldda  = { :one => 1 , :two => 2 , :three => 3}
     shouldda.each do |k,v|